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In Reply to: RE: I had a nice talk with Doc Hoyer. posted by Lee of Omaha on February 26, 2015 at 08:59:11:
"a. The cathode output winding is mostly for feedback and secondarily for output power."
Both cathode and anode windings contribute equally to output.
"b. Wiring the output tubes Plate 1 to Screen 2 and Plate 2 to Screen 1 gives ultra-high gain in the output stage which is then beaten into submission with feedback. The result is less required grid drive, higher power sensitivity, and maybe overall lower distortion. That took me a while to wrap my brain around, if I got it right."
This arrangement causes each output device to operate in true pentode mode by maintaining a constant voltage betw g2 and k under all normal operating conditions even though k voltage is varying at audio frequencies. g1 drive requirements are abnormally high: g1 AC voltage = anode AC voltage = cathode AC voltage.
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Follow Ups
- Another "understanding" of Mac output stage operation... - Steve O 15:11:16 02/26/15 (0)
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